In a message dated 10/23/2000 7:02:13 AM US Eastern Standard Time,
[log in to unmask] writes:

> Hi TechNetters,
>      I need some help regarding Cleanliness. Now I have an automatical test
> machine whose name is omega 600. I usually test 10 minutes for cleanliness
of
> PCB. Can anyone give me the best advice about the test time of omega 600
> machine which is used in PCB and tell me the cause ?

The 10 minute test is the one that has been in historical military specs for
ages.  No one tests longer than this because the numbers just keep going up.
Sometimes from leaching of the product, sometimes from carbon dioxide mixing
from the air.  If you want to know more about these instruments and their
general shortcomings, you should read EMPFs report RR00013, "An In-Depth Look
at Ionic Cleanliness Testing".  You can get it at EMPF.org or the IPC is
working on making that available as an IPC technical paper.

Doug Pauls
CSL

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